I recently visited the Binarium in Dortmund, Germany. It's a great place to visit if you want to see some of the machines emulated in MAME in person. Currently they have the consoles section open, with the computer section currently in progress. Here are some sample pictures:

Damn, I literally just returned today from a short trip to Dortmund where I visited some friends. Didn't know that this thing exists. I'll put it on my to-do list for the next time I'm up there, thanks for sharing!